[Bug tree-optimization/120265] New: Optimize modular counters

[mcccs at gmx dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120265

            Bug ID: 120265
           Summary: Optimize modular counters
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mcccs at gmx dot com
  Target Milestone: ---

I have a patch, opening this pr to reserve pr number for testcase.

we'd like to optimize

unsigned hours = 0;
for (...) {
    ...
    hours++;
    hours %= 60;
}

to

unsigned hours = 0;
for (...) {
    ...
    hours++;
    hours = hours == 60 ? 0 : hours;
}